Finding the Fourth Proportional to 1,087.38, 1,498.91 and 865.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,087.38 : 1,498.91 = 865.98 : x
2. Step 2: Convert to fraction form
   1,087.38/1,498.91 = 865.98/x
3. Step 3: Cross multiply
   1,087.38x = 1,498.91 × 865.98
4. Step 4: Simplify right side
   1,087.38x = 1,298,021.75
5. Step 5: Solve for x
   x = 1,298,021.75/1,087.38
6. Step 6: Final answer
   x = 1,193.71